<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow @click-left="$router.back()" title="黑马头条"></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.content" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
          <FollowUser :is-followed="article.is_followed" :user-id="article.aut_id" class="follow-btn" @update-is_followed="article.is_followed = $event"></FollowUser>
          <!-- <van-button :loading="folloeLoading" v-if="article.is_followed" class="follow-btn" round size="small" @click="onFollow">已关注</van-button>
          <van-button :loading="folloeLoading" v-else class="follow-btn" type="info" color="#3296fa" round size="small" icon="plus" @click="onFollow">关注</van-button> -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div ref="article-content" class="article-content markdown-body" v-html="article.content">
          <!-- <hr>
          文章正文
          <hr> -->
        </div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论 -->
        <CommentList @replay-click="onReplayClick" type="a" :list2="commentList" :source="article.art_id" @onload-success="updateComment"></CommentList>
        <!-- 文章评论结束 -->
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button @click="isPostShow = true" class="comment-btn" type="default" round size="small">写评论</van-button>
          <van-icon name="comment-o" :badge="this.totalCommontCount" color="#777" />
          <CollectArticle :article-id="article.art_id" class="star" v-model="article.is_collected"></CollectArticle>
          <!-- <van-icon color="#777" name="good-job-o" /> -->
          <LikeArticle class="like" :article-id="article.art_id" v-model="article.attitude"></LikeArticle>
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->
        <van-popup v-model="isPostShow" position="bottom">
          <CommentPost @post-success="onPostSuccess" :target="article.art_id"></CommentPost>
        </van-popup>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errStatue === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="loadArticle" class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
    <!-- 评论回复 -->
    <van-popup v-model="isReplayShow" position="bottom" style="height: 100%">
      <CommentReply v-if="isReplayShow" @close="isReplayShow = false" :comment="currentComment"></CommentReply>
    </van-popup>
    <!-- 评论回复 -->
  </div>
</template>

<script>
import { getArticleByID } from '@/api/article.js'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user/index.vue'
import CollectArticle from '@/components/collect-article/index.vue'
import LikeArticle from '@/components/like-article/index.vue'
import CommentList from './components/comment-list.vue'
import CommentPost from './components/comment-post.vue'
import CommentReply from './components/comment-replay.vue'

export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    CommentList,
    CommentPost,
    CommentReply
  },
  // eslint-disable-next-line space-before-function-paren
  // 给所有的后代组件提供数据
  provide() {
    return {
      articleID: this.articleID
    }
  },
  props: {
    articleID: {
      type: [Number, String],
      required: true
    }
  },
  data() {
    return {
      article: {}, // 文章详情
      loading: true,
      errStatue: 0, // 错误的状态码
      folloeLoading: false,
      totalCommontCount: 0, // 评论数量的初始值
      isPostShow: false,
      commentList: [],
      isReplayShow: false,
      currentComment: {} // 评论回复的对象
    }
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticle()
  },
  mounted() {},
  methods: {
    async loadArticle() {
      this.loading = true
      try {
        const { data } = await getArticleByID(this.articleID)
        // console.log(data)
        this.article = data.data
        // this.loading = false
        // 数据驱动视图 不能及时的拿到数据 所以为了能拿到数据 用定时器
        setTimeout(() => {
          // console.log(this.$refs['article-content'])
          this.previewImage()
        }, 0)
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatue = 404
        }
        // this.loading = false

        console.log('数据请求失败', err)
      }
      this.loading = false
    },
    previewImage() {
      // 得到所有的img结点
      const articleContent = this.$refs['article-content']

      const imgs = articleContent.querySelectorAll('img')
      // console.log(imgs)
      const images = []
      imgs.forEach((img, index) => {
        images.push(img.src)
        img.onclick = () => {
          ImagePreview({
            // 预览的图片地址数组
            images,
            // 起始位置，从0开始
            startPosition: index
          })
        }
      })
    },
    updateComment(data) {
      this.totalCommontCount = data.total_count
      // 获取评论的数组
      this.commentList = [...this.commentList, ...data.results]
    },
    onPostSuccess(data) {
      this.isPostShow = false
      // 把最新发布的评论置顶
      this.commentList.unshift(data.new_obj)
    },
    onReplayClick(comment) {
      // console.log(comment)
      this.isReplayShow = true
      this.currentComment = comment
    }
  }
}
</script>

<style scoped lang="less">
@import './github-markdown.css';
.article-container {
  .van-nav-bar {
    background-color: #3296fa;
    /deep/.van-icon {
      color: #fff;
    }
  }
  /deep/.van-nav-bar__title {
    color: #fff;
  }
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
    .star {
      border: none;
    }
    .like {
      border: none;
      padding: 0;
    }
  }
}
</style>
